US3830376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telescopic jib and bearing means therefor
Assignee: Harnischfeger Corp
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Filing: 1973-02-16
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Granted: 1974-08-20
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Expires: 1993-02-16
Abstract
Abstract A mobile crane comprises a multisection telescopic boom and an optionally usable multisection telescopic lattice type jib (having a base section and axially movable intermediate and fly sections) which when not in use is telescoped and stored on a support in parallel reverse disposition alongside the boom. Each jib section comprises four hollow tubular longitudinal members (each of rectangular cross section) arranged in parallel spaced apart relationship with a plurality of angularly disposed tubular cross braces connected between each pair of members to define a jib section of rectangular cross section. Each longitudinal member is rotated on its axis to present opposite inwardly and outwardly facing flat bearing surfaces and also to present two other opposite flat surfaces to which the ends of the cross braces are welded. Bearing means are provided to facilitate relative sliding motion and to transmit thrust forces between adjacent jib sections. The bearing means comprises inwardly facing slide pads mounted at the lower front ends of the base and intermediate sections and outwardly facing slide pads mounted at the upper and lower rear ends of the intermediate and fly sections; each slide pad being mounted on a support secured within the hollow end of a tubular longitudinal member and engaged with an appropriate bearing surface on an adjacent jib section. To unstore the jib and set it up for use, the foot end of the jib is releasably connected by pivot pin means to the point end of the boom and the boom is partially extended to axially move the jib forward clear of its support. At this stage the unextended jib may be swung 180* about the pivot pin means into axial alignment with the boom and rigidly secured thereto by suitable attachment means. Or, the jib may be partially or fully extended prior to being swung 180* by connecting either the jib intermediate section or the jib fly section, respectively, by releasable rear pin means to the boom base section and by then further extending the boom, either partially or fully, respectively. In all cases, prior to swinging the jib, a guy wire jib mast pivotally attached to the boom point and folded back alongside the boom is swung into upright position. The jib is designed so that it can be rigidly connected at an angle to the boom axis and so that the jib fly section can be rigidly connected at an angle to the jib axis.
Inventors
- 👤 R Fritsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:20
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/62; B66C23/64; B66C23/70; B66C23/701; B66C23/702; B66C23/707
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
228 words
In apparatus having a telescopic jib; at least a pair of relatively telescopic jib sections, each section comprising four parallel spaced apart hollow tubular longitudinal members, each longitudinal member in each section having a rectangular cross section and comprising diagonally inwardly and outwardly facing flat bearing surfaces on opposite sides thereof and two flat surfaces to which the ends of cross braces are welded and having a bore of non-circular cross-sectional configuration, cross braces for joining each adjacent pair of longitudinal members and defining four planar sides of said jib sections, each longitudinal member being disposed on its axis so that all surfaces thereof are at a 45* angle with respect to the sides of its jib section, and two inwardly facing slide pad assemblies mounted at the lower front end of one section, two outwardly facing slide pad assemblies mounted at the lower rear end of the other section, and two outwardly facing slide pad assemblies mounted at the upper rear end of said other section, each slide pad assembly comprising a slide pad support of non-circular cross-sectional configuration inserted into and non-rotatably engaged within the bore at an end of one of said longitudinal members and a slide pad having a flat surface mounted on said slide pad support and slidably engaged with a flat bearing surface on a longitudinal member in an adjacent jib section.
Claim 2
Dependent Claim
228 words
In apparatus having a telescopic jib; at least a pair of relatively telescopic jib sections, each section comprising four parallel spaced apart hollow tubular longitudinal members, each longitudinal member in each section having a rectangular cross section and comprising diagonally inwardly and outwardly facing flat bearing surfaces on opposite sides thereof and two flat surfaces to which the ends of cross braces are welded and having a bore of non-circular cross-sectional configuration, cross braces for joining each adjacent pair of longitudinal members and defining four planar sides of said jib sections, each longitudinal member being disposed on its axis so that all surfaces thereof are at a 45* angle with respect to the sides of its jib section, and two inwardly facing slide pad assemblies mounted at the lower front end of one section, two outwardly facing slide pad assemblies mounted at the lower rear end of the other section, and two outwardly facing slide pad assemblies mounted at the upper rear end of said other section, each slide pad assembly comprising a slide pad support of non-circular cross-sectional configuration inserted into and non-rotatably engaged within the bore at an end of one of said longitudinal members and a slide pad having a flat surface mounted on said slide pad support and slidably engaged with a flat bearing surface on a longitudinal member in an adjacent jib section.
Claim 3
Dependent Claim
41 words
A jib according to claim 1 wherein said slide pad support is reversely mountable within a longitudinal member so that said slide pad mounted thereon can face inwardly or outwardly with respect to a jib section on which it is mounted.
Claim 4
Dependent Claim
235 words
In a telescopic jib: a base section, an intermediate section telescopable within said base section, and a fly section telescopable within said intermediate section; each of said sections comprising four parallel spaced apart hollow tubular longitudinal members, each of said longitudinal members having a rectangular cross section and comprising generally diagonally inwardly and outwardly facing flat bearing surfaces on opposite sides thereof and further comprising two other flat surfaces; a series of angularly disposed tubular cross braces for joining each adjacent pair of longitudinal members in a section and defining sides of said section; said cross braces being welded at each end to one of said other flat surfaces of a longitudinal member; slide pad supports of rectangular cross section inserted into and now rotatably engaged within the ends of the longitudinal members at the front end of said base section, at both ends of said intermediate section, and at the rear end of said fly section; and flat slide pads mounted on the slide pad supports at the lower front end of said base section, at the upper and lower rear end of said intermediate section, at the lower front end of said intermediate section, and at the upper and lower rear end of said fly section, those slide pads at the lower front ends of said base section and said intermediate section being inwardly facing and all other slide pads being outwardly facing.
Claim 5
Dependent Claim
235 words
In a telescopic jib: a base section, an intermediate section telescopable within said base section, and a fly section telescopable within said intermediate section; each of said sections comprising four parallel spaced apart hollow tubular longitudinal members, each of said longitudinal members having a rectangular cross section and comprising generally diagonally inwardly and outwardly facing flat bearing surfaces on opposite sides thereof and further comprising two other flat surfaces; a series of angularly disposed tubular cross braces for joining each adjacent pair of longitudinal members in a section and defining sides of said section; said cross braces being welded at each end to one of said other flat surfaces of a longitudinal member; slide pad supports of rectangular cross section inserted into and now rotatably engaged within the ends of the longitudinal members at the front end of said base section, at both ends of said intermediate section, and at the rear end of said fly section; and flat slide pads mounted on the slide pad supports at the lower front end of said base section, at the upper and lower rear end of said intermediate section, at the lower front end of said intermediate section, and at the upper and lower rear end of said fly section, those slide pads at the lower front ends of said base section and said intermediate section being inwardly facing and all other slide pads being outwardly facing.
Claim 6
Dependent Claim
23 words
A jib according to claim 3 wherein all slide pad supports at one end of a section are interconnected by a supporting framework.
Claim 7
Dependent Claim
41 words
A jib according to claim 3 wherein said slide pad support is reversely mountable within a longitudinal member so that said slide pad mounted thereon can face inwardly or outwardly with respect to a jib section on which it is mounted.
Claim 8
Dependent Claim
169 words
In a telescopic jib: at least a pair of relatively telescopic jib sections, each of said jib sections comprising a plurality of parallel sPaced apart hollow tubular longitudinal members, each of said longitudinal members being of rectangular cross section and comprising inwardly and outwardly facing flat bearing surfaces, and a plurality of slide pad assemblies to facilitate relative telescopic movement and transfer thrust forces between said jib sections, each slide pad assembly comprising a slide pad support of rectangular cross section inserted into and non-rotatably engaged within an end of a longitudinal member of one jib section, a slide pad mounted on said slide pad support and slidably engaged with a flat bearing surface on a longitudinal member of another jib section, and bolt means for securing said slide pad to said slide pad support, each slide pad support being reversely mountable within a longitudinal member so that said slide pad mounted thereon can face inwardly or outwardly with respect to a jib section on which it is mounted.
Claim 9
Dependent Claim
169 words
In a telescopic jib: at least a pair of relatively telescopic jib sections, each of said jib sections comprising a plurality of parallel sPaced apart hollow tubular longitudinal members, each of said longitudinal members being of rectangular cross section and comprising inwardly and outwardly facing flat bearing surfaces, and a plurality of slide pad assemblies to facilitate relative telescopic movement and transfer thrust forces between said jib sections, each slide pad assembly comprising a slide pad support of rectangular cross section inserted into and non-rotatably engaged within an end of a longitudinal member of one jib section, a slide pad mounted on said slide pad support and slidably engaged with a flat bearing surface on a longitudinal member of another jib section, and bolt means for securing said slide pad to said slide pad support, each slide pad support being reversely mountable within a longitudinal member so that said slide pad mounted thereon can face inwardly or outwardly with respect to a jib section on which it is mounted.
Claim 10
Dependent Claim
25 words
A jib according to claim 6 wherein each said slide pad assembly includes shim means disposed between said slide pad support and said slide pad.
Claim 11
Dependent Claim
22 words
A jib according to claim 6 wherein said slide pad support includes a relieved portion at which said slide pad is mounted.
Claim 12
Dependent Claim
40 words
A jib according to claim 8 wherein said slide pad assembly includes shim means disposed between said slide pad and said relieved portion, and including bolt means for securing said slide pad and shim means to said slide pad support.
Claim 13
Dependent Claim
138 words
In a jib section for a telescopic jib: a plurality of parallel spaced apart hollow tubular longitudinal members, each longitudinal member comprising diagonally inwardly and outwardly facing flat bearing surfaces on opposite sides thereof and having a bore of noncircular cross-sectional configuration, a series of cross braces for joining each adjacent pair of longitudinal members and defining sides of said jib section, slide pad assemblies, each comprising a slide pad support of non-circular cross-sectional configuration inserted into and nonrotatably engaged within an end of a longitudinal member and a flat slide pad mounted parallel to and adjacent the plane of the bearing surface of the member on said slide pad support, and a supporting framework generally within the plane of said braces, connected to and between the slide pad supports in said plurality of slide pad supporting assemblies.
Claim 14
Dependent Claim
138 words
In a jib section for a telescopic jib: a plurality of parallel spaced apart hollow tubular longitudinal members, each longitudinal member comprising diagonally inwardly and outwardly facing flat bearing surfaces on opposite sides thereof and having a bore of noncircular cross-sectional configuration, a series of cross braces for joining each adjacent pair of longitudinal members and defining sides of said jib section, slide pad assemblies, each comprising a slide pad support of non-circular cross-sectional configuration inserted into and nonrotatably engaged within an end of a longitudinal member and a flat slide pad mounted parallel to and adjacent the plane of the bearing surface of the member on said slide pad support, and a supporting framework generally within the plane of said braces, connected to and between the slide pad supports in said plurality of slide pad supporting assemblies.
Claim 15
Dependent Claim
17 words
A jib section according to claim 10 wherein said plurality of slide pad assemblies comprises a pair.
Claim 16
Dependent Claim
29 words
A jib section according to claim 10 wherein said plurality of slide pad assemblies comprises an upper pair and a lower pair and wherein said supporting framework is rectangular.
Claim 17
Dependent Claim
132 words
In a jib section for a telescopic jib: four parallel spaced apart hollow tubular longitudinal members, each of said longitudinal members being of rectangular cross section and comprising diagonally inwardly and outwardly facing flat bearing surfaces on opposite sides thereof, a series of cross braces joining each adjacent pair of longitudinal members and defining planar sides of said jib section, a slide pad support inserted into and engaged within an end of each longitudinal member at least at one end of said section, a flat slide pad parallel to and close to the plane of the adjacent bearing surfaces mounted on at least two of said slide pad supports, and a supporting framework connected to and between all of said slide pad supports and disposed generally in the planes of said sides.
Claim 18
Dependent Claim
132 words
In a jib section for a telescopic jib: four parallel spaced apart hollow tubular longitudinal members, each of said longitudinal members being of rectangular cross section and comprising diagonally inwardly and outwardly facing flat bearing surfaces on opposite sides thereof, a series of cross braces joining each adjacent pair of longitudinal members and defining planar sides of said jib section, a slide pad support inserted into and engaged within an end of each longitudinal member at least at one end of said section, a flat slide pad parallel to and close to the plane of the adjacent bearing surfaces mounted on at least two of said slide pad supports, and a supporting framework connected to and between all of said slide pad supports and disposed generally in the planes of said sides.
Claim 19
Dependent Claim
19 words
A jib section according to claim 13 including a slide pad mounted on each of said slide pad supports.
Claim 20
Dependent Claim
41 words
A jib according to claim 13 wherein said slide pad support is reversely mountable within a longitudinal member so that said slide pad mounted thereon can face inwardly or outwardly with respect to a jib section on which it is mounted.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |